# Base emitter voltage and collector current

Does decrease in value of base-emitter voltage decreases collector current..??
As I studied that decrease in base-emitter voltage of some part of signal to lesser ammplification of that part due to smaller current..but how base emitter voltage is leading to less collector current..
because if base-emitter voltage decrease , base current increase which further increase collector current..

NascentOxygen
Staff Emeritus
Does decrease in value of base-emitter voltage decreases collector current..??
Yes.

As I studied that decrease in base-emitter voltage of some part of signal to lesser ammplification of that part due to smaller current..but how base emitter voltage is leading to less collector current..
because if base-emitter voltage decrease , base current increase which further increase collector current..
If VBE decreases, base current decreases. It's a p-n junction, so the characteristic is that of a p-n junction diode. If the forward voltage increases, the forward current increases.

But base-emitter voltage is a barrier voltage.. so if it decreases , base current should increase..!!!

dlgoff
Gold Member
But base-emitter voltage is a barrier voltage.. so if it decreases , base current should increase..!!!
No. NascentOxygen has given you the correct answer. Consider the Base-Emitter Voltage curves:

Check out these Base-Emitter Junction Details.

But is'nt there any logic behind it...??
because if we see this equ.
Ib=Vb/Rb - Vbe/Rb
so from this equ. it can be seen that if Vbe increase base current decrease..!!!

jim hardy
Gold Member
Dearly Missed
have you ever run across the formula for current through a junction,
I=eqv/kt
where v would be your Vbe ?
That's what dlgoff's graph is showing you.

because if we see this equ.
Ib=Vb/Rb - Vbe/Rb
so from this equ. it can be seen that if Vbe increase base current decrease..!!!

that involves not only Vbe but an external Vb and an external Rb.